#share-button {
  width: 3.25rem;
  height: 3.25rem;
  padding: 0;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
  background-color: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(4px);
  transition: transform 0.15s ease, background-color 0.2s ease,
    border-color 0.2s ease, color 0.2s ease;
}

/* Bootstrap's outline-button hover normally flips text to white assuming the
   background also flips to solid; we keep the background light, so pin the
   icon color here too or it goes white-on-white. */
#share-button:hover,
#share-button:focus {
  transform: scale(1.08);
  background-color: #fff;
  color: var(--bs-primary, #2c3e50);
  border-color: var(--bs-primary, #2c3e50);
}

#share-button:active {
  transform: scale(0.94);
}

#share-button-icon {
  font-size: 1.2rem;
}